US7177716B2 - Methods and apparatus for material control system interface - Google Patents

Methods and apparatus for material control system interface Download PDF

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Publication number
US7177716B2
US7177716B2 US11/067,311 US6731105A US7177716B2 US 7177716 B2 US7177716 B2 US 7177716B2 US 6731105 A US6731105 A US 6731105A US 7177716 B2 US7177716 B2 US 7177716B2
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Prior art keywords
storage locations
carrier storage
reserved
priority lots
lots
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US11/067,311
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US20050273190A1 (en
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David C. Duffin
Daniel R. Jessop
Michael Teferra
Amitabh Puri
Glade L. Warner
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Applied Materials Inc
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Applied Materials Inc
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Assigned to APPLIED MATERIALS, INC. reassignment APPLIED MATERIALS, INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: DUFFIN, DAVID C., JESSOP, DANIEL R., WARNER, GLADE L., PURI, AMITABH, TEFERRA, MICHAEL
Publication of US20050273190A1 publication Critical patent/US20050273190A1/en
Priority to US11/626,509 priority patent/US7603196B2/en
Application granted granted Critical
Publication of US7177716B2 publication Critical patent/US7177716B2/en
Priority to US11/838,284 priority patent/US7522969B2/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
    • B26D1/00—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor
    • B26D1/0006—Cutting members therefor
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B19/00—Programme-control systems
    • G05B19/02—Programme-control systems electric
    • G05B19/418—Total factory control, i.e. centrally controlling a plurality of machines, e.g. direct or distributed numerical control [DNC], flexible manufacturing systems [FMS], integrated manufacturing systems [IMS] or computer integrated manufacturing [CIM]
    • G05B19/4189—Total factory control, i.e. centrally controlling a plurality of machines, e.g. direct or distributed numerical control [DNC], flexible manufacturing systems [FMS], integrated manufacturing systems [IMS] or computer integrated manufacturing [CIM] characterised by the transport system
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
    • G06Q10/00—Administration; Management
    • G06Q10/06—Resources, workflows, human or project management; Enterprise or organisation planning; Enterprise or organisation modelling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
    • B26D1/00—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor
    • B26D1/0006—Cutting members therefor
    • B26D2001/0053—Cutting members therefor having a special cutting edge section or blade section
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
    • B26D1/00—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor
    • B26D1/0006—Cutting members therefor
    • B26D2001/006—Cutting members therefor the cutting blade having a special shape, e.g. a special outline, serrations
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B2219/00—Program-control systems
    • G05B2219/30—Nc systems
    • G05B2219/31—From computer integrated manufacturing till monitoring
    • G05B2219/31002—Computer controlled agv conveys workpieces between buffer and cell
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B2219/00—Program-control systems
    • G05B2219/30—Nc systems
    • G05B2219/32—Operator till task planning
    • G05B2219/32266—Priority orders
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B2219/00—Program-control systems
    • G05B2219/30—Nc systems
    • G05B2219/32—Operator till task planning
    • G05B2219/32277—Agv schedule integrated into cell schedule
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B2219/00—Program-control systems
    • G05B2219/30—Nc systems
    • G05B2219/45—Nc applications
    • G05B2219/45031—Manufacturing semiconductor wafers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
    • H01L21/67—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere
    • H01L21/67005—Apparatus not specifically provided for elsewhere
    • H01L21/67242—Apparatus for monitoring, sorting or marking
    • H01L21/67276—Production flow monitoring, e.g. for increasing throughput
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
    • H01L21/67—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere
    • H01L21/677—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere for conveying, e.g. between different workstations
    • H01L21/67763—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere for conveying, e.g. between different workstations the wafers being stored in a carrier, involving loading and unloading
    • H01L21/67769—Storage means
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
    • Y02P90/02—Total factory control, e.g. smart factories, flexible manufacturing systems [FMS] or integrated manufacturing systems [IMS]

Definitions

  • the present invention relates generally to electronic device fabrication systems, and is more particularly concerned with transferring substrate carriers between transport systems and processing tools within a fabrication facility.
  • Manufacturing of electronic devices typically involves performing a sequence of procedures with respect to a substrate such as a silicon substrate, a glass plate, etc. (Such substrates may also be referred to as wafers, whether patterned or unpatterned.) These steps may include polishing, deposition, etching, photolithography, heat treatment, and so forth. Usually a number of different processing steps may be performed in a single processing system or “tool” which includes a plurality of processing chambers. However, it is generally the case that other processes are required to be performed at other processing locations within a fabrication facility, and it is accordingly necessary that substrates be transported within the fabrication facility from one processing location to another. Depending upon the type of electronic device to be manufactured, there may be a relatively large number of processing steps required to be performed at many different processing locations within the fabrication facility.
  • substrate carriers such as sealed pods, cassettes, containers and so forth. It is also conventional to employ automated substrate carrier transport devices, such as automatic guided vehicles, overhead transport systems, substrate carrier handling robots, etc., to move substrate carriers from location to location within the fabrication facility or to transfer substrate carriers from or to a substrate carrier transport device.
  • automated substrate carrier transport devices such as automatic guided vehicles, overhead transport systems, substrate carrier handling robots, etc.
  • the total fabrication process from formation or receipt of the virgin substrate to cutting of semiconductor devices from the finished substrate, may require an elapsed time that is measured in weeks or months.
  • a large number of substrates may accordingly be present at any given time as “work in progress” (WIP).
  • WIP work in progress
  • the substrates present in the fabrication facility as WIP may represent a very large investment of working capital, which tends to increase the per substrate manufacturing cost. It may therefore be desirable to reduce the amount of WIP for a given substrate throughput for the fabrication facility. To do so, the total elapsed time for processing each substrate should be reduced.
  • a method in which the number of priority lots to be processed is determined, an equivalent number of carrier storage locations are reserved at a substrate loading station of a processing tool, the number of reserved carrier storage locations are made available, and priority lots are transferred to the reserved carrier storage locations.
  • a substrate loading station including a controller and a memory including instructions to be executed by the controller is adapted to determine a number of priority lots to be processed, reserve an equivalent number of carrier storage locations at a substrate loading station of a processing tool, make the number of reserved carrier storage locations available, and transfer priority lots to the reserved carrier storage locations.
  • a system in a third aspect of the invention, includes a first substrate loading station having a first processing tool and a plurality of carrier storage locations, a second substrate loading station having a second processing tool and a plurality of carrier storage locations, a transport system for moving carriers between the first and second loading stations, and a manufacturing execution system.
  • the manufacturing execution system is operative to determine a number of priority lots to be processed, reserve a number of carrier storage locations at each of the first and second substrate loading stations wherein the number of carrier storage locations is based on the number of priority lots, make the number of reserved carrier storage locations available at each of the first and second substrate loading stations, and transfer priority lots to the reserved carrier storage locations at the first substrate loading station.
  • FIG. 1 is a block diagram depicting an example of a control system for an electronic device manufacturing facility according to some embodiments of the present invention.
  • FIG. 2 is a schematic diagram depicting an example of an electronic device manufacturing facility according to some embodiments of the present invention.
  • FIG. 3 is a front elevational view depicting an example of a carrier handler according to some embodiments of the present invention.
  • FIG. 4 is a flowchart depicting an example process for managing priority lots in a transport system according to some embodiments of the present invention.
  • FIG. 5 is a schematic diagram depicting example operation of an electronic device manufacturing facility according to some embodiments of the present invention.
  • the present invention provides methods and apparatus for expediting processing of substrate lots identified as priority lots.
  • the features of the present invention are particularly advantageous with the use of single or small lot size substrate carriers.
  • the term “small lot size” substrate carrier or “small lot” carrier may refer to a carrier that is adapted to hold fewer substrates than a conventional “large lot size” carrier which typically holds thirteen or twenty-five substrates.
  • a small lot size carrier may be adapted to hold five or less substrates.
  • other small lot size carriers may be employed (e.g., small lot size carriers that hold one, two, three, four or more than five substrates, but less than that of a large lot size carrier).
  • each small lot size carrier may hold too few substrates for human transport of carriers to be viable within an electronic device or other manufacturing facility.
  • a substrate loading station that serves a processing tool may include internal carrier storage locations proximate to a port of the processing tool. In operation it may be desirable to have the next lot of substrates to be processed either in carriers held in internal carrier storage locations or in a carrier ready to be transferred directly from the transport system to the port. In a system operating at near maximum capacity, the availability of internal carrier storage locations within a substrate loading station may be limited. The present invention provides methods and apparatus wherein internal carrier storage locations may be reserved for carriers containing priority lots.
  • Carriers containing non-priority lots may be removed from the reserved locations either by transferring the non-priority lots to alternate storage locations or by processing the non-priority lots and moving the processed non-priority lots to non-reserved storage locations in a substrate loading station at a next processing tool. As the reserved internal storage locations become available, carriers containing priority substrate lots may be transferred into the reserved internal storage locations.
  • An electronic device manufacturing or fabrication facility may use an overhead transport system (OHT system) that includes a plurality of carrier supports or “cradles” coupled to a continuously moving conveyor system adapted to transfer one or more substrate carriers about the facility. More specifically, the moving conveyor system may include a band and a plurality of drive motors coupled thereto, which are adapted to move the band.
  • OHT system overhead transport system
  • the moving conveyor system may include a band and a plurality of drive motors coupled thereto, which are adapted to move the band.
  • Such a facility may include tools or composite tools adapted to process a substrate during electronic device manufacturing.
  • Each processing tool may be coupled to a respective substrate loading station including a carrier handler adapted to transfer a substrate carrier between the tool and the moving conveyor system. More specifically, each processing tool may be coupled to a respective carrier handler adapted to transfer a substrate carrier between a load port of the processing tool and a carrier support coupled to the band of the continuously moving conveyor system. In this manner, a substrate carrier may be transferred about the facility.
  • a transport system may include a control system adapted to communicate with and control operation of the moving conveyor system and a plurality of carrier handlers such that substrate carriers may be moved to where they are needed.
  • a control system 100 may include a host or material control system (MCS) 102 that is in two-way communication with loading station software (LSS) 104 a–f executing on each of the controllers of each of the plurality of carrier handlers housed in and/or under the control of substrate loading stations.
  • the host may include a manufacturing execution system (MES) that directs the operations of the MCS.
  • MES manufacturing execution system
  • the MCS 102 may also be in two-way communication with a transport system controller (TSC) 106 that maintains the operation of the transport system including drive motors and the conveyor.
  • TSC transport system controller
  • each of the LSS 104 a–f nodes may communicate with the TSC 106 to directly exchange information regarding the status of the transport system.
  • FIG. 2 a schematic diagram is provided depicting an example embodiment of a physical arrangement of an example Fab 201 that is especially well suited for using small lot size substrate carriers, such as substrate carriers that hold a single substrate or fewer than twenty-five substrates.
  • the depicted Fab 201 includes a high-speed transport system with several features that make it particularly suitable for using small lot carriers including: a high-speed, low maintenance, constantly moving conveyor system; a carrier loading/unloading function that does not require stopping or slowing the conveyor; a conveyor that is able to physically support many carriers at one time; a flexible conveyor that may be readily customized to a desired transport path; and control software adapted to efficiently manage transport and transfers between process tools.
  • Previously incorporated U.S. patent application Ser. No. 10/650,310, filed Aug. 28, 2003 and titled “System For Transporting Substrate Carriers”, discloses a substrate carrier transport system or similar delivery system that includes a conveyor for substrate carriers that is intended to be constantly in motion during operation of the Fab which it serves.
  • the constantly moving conveyor is intended to facilitate transportation of substrates within the Fab so as to reduce the total “dwell” time of each substrate in the Fab.
  • a substrate loading station 300 equipped with a carrier handler 302 may include a controller 304 , a horizontal guide 306 that is moveable vertically along a frame 307 or rails, and an end effector 308 that is moveable horizontally along the horizontal guide 306 .
  • Other configurations e.g., a robot that can move in more than two dimensions
  • a carrier handler 302 /substrate loading station 300 may further include internal storage locations 310 or shelves/hangars for temporarily storing substrate carriers 312 .
  • ports 314 for loading substrates into process tools may be accessible to the carrier handler 302 or be part of a substrate loading station 300 housing a carrier handler 302 .
  • the controller 304 may be implemented using a field programmable gate array (FPGA) or other similar device. In some embodiments, discrete components may be used to implement the controller 304 .
  • the controller 304 may be adapted to control and/or monitor the operation of the substrate loading station 300 and one or more of various electrical and mechanical components and systems of the substrate loading station 300 which are described herein.
  • the controller 304 may be adapted to execute loading station software as indicated above.
  • the controller 304 may be any suitable computer or computer system, or may include any number of computers or computer systems.
  • the controller 304 may be or may include any components or devices which are typically used by, or used in connection with, a computer or computer system. Although not explicitly pictured in FIG. 3 , the controller 304 may include one or more central processing units, read only memory (ROM) devices and/or a random access memory (RAM) devices. The controller 304 may also include input devices such as a keyboard and/or a mouse or other pointing device, and output devices such as a printer or other device via which data and/or information may be obtained, and/or a display device such as a monitor for displaying information to a user or operator.
  • ROM read only memory
  • RAM random access memory
  • the controller 304 may also include a transmitter and/or a receiver such as a LAN adapter or communications port for facilitating communication with other system components and/or in a network environment, one or more databases for storing any appropriate data and/or information, one or more programs or sets of instructions for executing methods of the present invention, and/or any other computer components or systems, including any peripheral devices.
  • a transmitter and/or a receiver such as a LAN adapter or communications port for facilitating communication with other system components and/or in a network environment, one or more databases for storing any appropriate data and/or information, one or more programs or sets of instructions for executing methods of the present invention, and/or any other computer components or systems, including any peripheral devices.
  • instructions of a program may be read into a memory of the controller 304 from another medium, such as from a ROM device to a RAM device or from a LAN adapter to a RAM device. Execution of sequences of the instructions in the program may cause the controller 304 to perform one or more of the process steps described herein.
  • hard-wired circuitry or integrated circuits may be used in place of, or in combination with, software instructions for implementation of the processes of the present invention.
  • embodiments of the present invention are not limited to any specific combination of hardware, firmware, and/or software.
  • the memory may store the software for the controller which may be adapted to execute the software program, and thereby operate in accordance with the present invention, and particularly in accordance with the methods described in detail below.
  • Portions of the present invention may be embodied as a program developed using an object oriented language that allows the modeling of complex systems with modular objects to create abstractions that are representative of real world, physical objects and their interrelationships.
  • object oriented language that allows the modeling of complex systems with modular objects to create abstractions that are representative of real world, physical objects and their interrelationships.
  • the invention as described herein can be implemented in many different ways using a wide range of programming techniques as well as general purpose hardware sub-systems or dedicated controllers.
  • the program may be stored in a compressed, uncompiled and/or encrypted format.
  • the program furthermore may include program elements that may be generally useful, such as an operating system, a database management system and device drivers for allowing the controller to interface with computer peripheral devices and other equipment/components.
  • Appropriate general purpose program elements are known to those skilled in the art, and need not be described in detail herein.
  • the controller 304 may generate, receive, and/or store databases including data related to carrier locations, command queues, actual and/or estimated command execution times, and/or internal storage locations.
  • databases including data related to carrier locations, command queues, actual and/or estimated command execution times, and/or internal storage locations.
  • the end effector 308 is moved horizontally at a velocity that substantially matches the velocity of the substrate carrier 312 as it is being transported by the substrate carrier conveyor 316 (e.g., by substantially matching substrate carrier speed in a horizontal direction).
  • the end effector 308 may be maintained in a position adjacent the substrate carrier 312 as the substrate carrier 312 is being transported. The end effector 308 thus may substantially match a position of the substrate carrier 312 while substantially matching a velocity of the substrate carrier 312 .
  • conveyor position and/or velocity may be substantially matched.
  • the end effector 308 While the end effector 308 substantially matches the substrate carrier's velocity (and/or position), the end effector 308 is raised so that the end effector 308 contacts the substrate carrier 312 and disengages the substrate carrier 312 from the substrate carrier conveyor 316 .
  • a substrate carrier 312 similarly may be loaded onto the moving substrate carrier conveyor 316 by substantially matching end effector 308 and conveyor velocities (and/or positions) during loading. In at least one embodiment, such substrate carrier handoffs between the end effector 308 and substrate carrier conveyor 316 are performed at a substantially zero velocity and/or acceleration difference between the end effector 308 and the substrate carrier conveyor 316 .
  • Previously incorporated U.S. patent application Ser. No. 10/764,982, filed Jan. 26, 2004 and titled “Methods and Apparatus for Transporting Substrate Carriers”, describes a conveyor system that may be employed with the above-described substrate carrier transport system 316 and/or carrier handler 302 for transporting substrate carriers between one or more processing tools of a electronic device manufacturing facility.
  • the conveyor system may include a ribbon (or “band”) that forms a closed loop within at least a portion of the electronic device manufacturing facility and that transports substrate carriers therein.
  • the ribbon or band may be formed from stainless steel, polycarbonate, composite materials (e.g., carbon graphite, fiberglass, etc.), steel or otherwise reinforced polyurethane, epoxy laminates, plastic or polymer materials that include stainless steel, fabric (e.g., carbon fiber, fiberglass, Kevlar® available from Dupont, polyethylene, steel mesh, etc.) or another stiffening material, etc.
  • the ribbon By orienting the ribbon so that a thick portion of the ribbon resides within a vertical plane and a thin portion of the ribbon resides within a horizontal plane, the ribbon is flexible in the horizontal plane and rigid in the vertical plane. Such a configuration allows the conveyor to be constructed and implemented inexpensively.
  • the ribbon requires little material to construct, is easy to fabricate and, due to its vertical rigidity/strength, can support the weight of numerous substrate carriers without supplemental support structure (such as rollers or other similar mechanisms used in conventional, horizontally-oriented belt-type conveyor systems).
  • supplemental support structure such as rollers or other similar mechanisms used in conventional, horizontally-oriented belt-type conveyor systems.
  • the conveyor system is highly customizable because the ribbon may be bent, bowed or otherwise shaped into numerous configurations due to its lateral flexibility.
  • the example Fab 201 includes a ribbon or band 203 that forms a simple loop 205 within the Fab 201 .
  • the ribbon 203 may comprise, for example, one of the ribbons described in previously incorporated U.S. patent application Ser. No. 10/764,982.
  • the ribbon 203 transports substrate carriers (not shown) between processing tools 209 , and comprises straight portions 211 and curved portions 213 to form the (closed) loop 205 .
  • Other number of processing tools 209 and/or loop configurations may be employed.
  • Each processing tool 209 may include a substrate carrier handler at a substrate loading station or “loading station” 215 of the processing tool 209 for unloading a substrate carrier from or for loading a substrate carrier onto the moving ribbon 203 of the conveyor system 207 as the ribbon 203 passes by the loading station 215 (as described in previously incorporated U.S. patent application Ser. No. 10/650,480).
  • an end effector 308 ( FIG. 3 ) of a loading station 215 may be moved horizontally at a velocity that substantially matches the velocity of the substrate carrier as it is being transported by the ribbon 203 , maintained in a position adjacent the substrate carrier as the substrate carrier is being transported and raised so that the end effector contacts the substrate carrier and disengages the substrate carrier from the conveyor system 207 .
  • a substrate carrier similarly may be loaded onto the moving ribbon 203 by substantially matching end effector 308 ( FIG. 3 ) and ribbon velocities (and/or positions) during loading.
  • Each loading station 215 may include one or more ports (e.g., load ports) or similar locations where substrates or substrate carriers are placed for transfer to and/or from a processing tool 209 (e.g., one or more docking stations, although transfer locations that do not employ docking/undocking movement may be employed).
  • a processing tool 209 e.g., one or more docking stations, although transfer locations that do not employ docking/undocking movement may be employed.
  • Various substrate carrier storage locations or shelves also may be provided at each loading station 215 for substrate carrier buffering at a processing tool 209 .
  • the conveyor system 207 may include a transport system controller (TSC) 217 for controlling operation of the ribbon 203 .
  • TSC transport system controller
  • the TSC 217 may control/monitor the speed and/or status of the ribbon 203 , allocate carrier supports of the ribbon 203 that are used to support/transport substrate carriers, monitor the status of such carrier supports, provide such information to each loading station 215 or the like.
  • each loading station 215 may include LSS 219 for controlling carrier handler operation (e.g., loading or unloading of substrate carriers to/from the conveyor system 207 , transporting of substrate carriers to/from load ports or storage locations of the loading station 215 and/or processing tool 209 serviced by the loading station 215 , etc.).
  • a MCS 221 communicates with the transport system controller 217 and the loading station software 219 of each substrate loading station 215 for affecting operation of the same.
  • the TSC 217 , each LSS 219 and/or the MCS 221 may include a scheduler (not shown) for controlling scheduling of the operations performed by the TSC 217 , LSS 219 and/or the MCS 221 .
  • the system discussed above including the hardware and software components, are useful to perform the methods of the invention. However, it should be understood that not all of the above described components are necessary to perform any of the present invention's methods. In fact, in some embodiments, none of the above described system is required to practice the present invention's methods.
  • the system described above is an example of a system that would be useful in practicing the invention's methods and is especially well suited for transferring small lot size substrate carriers, such as substrate carriers that hold a single substrate or substantially fewer than twenty-five substrates.
  • a lot is moved to a stocker that services a bay.
  • the manufacturing execution system is notified with a “move in request” (MIR) message (e.g., a message from a tool controller, for example, that indicates that the tool load port is available).
  • MIR move in request
  • the MES selects the next lot for processing in the tool.
  • the lot is moved to the tool where processing begins.
  • the MES is notified with a “move out request” (MOR) message once processing of the lot is complete (e.g., a message that indicates that the contents of a substrate carrier have been processed within the tool).
  • MOR move out request
  • the MES may determine the next processing tool to which the small lot carrier is to be sent, as opposed to conventional large lot operation wherein the carrier would be sent to a buffer stocker to await being requested by the next processing tool. This is because in embodiments of the present invention, the MES is aware that the substrate loading station is equipped with internal storage locations and able to stage lots for the associated processing tool.
  • buffer stockers may be used by the MCS and/or substrate loading station as an alternate storage location.
  • the MCS may include a list of alternate storage locations.
  • the list of alternate storage locations may be configurable by an operator.
  • an algorithm implemented as a program may be used to select a preferred storage location from the list based upon a location's available storage capacity and/or proximity to the substrate loading station that requested the carrier be moved to an alternate storage location.
  • carriers stored in alternate storage locations may be moved automatically by the MCS to the substrate loading station that requested the carrier be moved to an alternate storage location as internal storage becomes available. Such carriers may be moved in an order based upon a priority of the individual carriers that reflects how soon the substrate loading station can use the carriers.
  • FIG. 4 a flowchart is depicted that represents some specific example embodiments of the present invention that may be performed using the systems described above. It must be understood that the particular arrangement of elements in the flowchart of FIG. 4 , as well as the number and order of example steps of various methods discussed herein, is not meant to imply a fixed order, sequence, quantity, and/or timing to the steps; embodiments of the present invention can be practiced in any order, sequence, and/or timing that is practicable.
  • the MCS 221 is responsible for delivery and storage of carriers in a bay, by sending commands to various equipment, which include substrate loading stations/carrier handlers and transfer stations (equipment that may perform conveyor band to band transfers, not shown herein).
  • various equipment include substrate loading stations/carrier handlers and transfer stations (equipment that may perform conveyor band to band transfers, not shown herein).
  • certain aspects of the carrier handler may me implemented in conformance with an industry standard entitled the SEMI E88-1103 standard “Specification for AMHS Storage SEM (Stocker SEM)”, which in particular details standardized commands and protocols for control of compliant devices.
  • a transport system controller (TSC) 117 which is responsible for controlling conveyor operation, may be implemented in conformance with the SEMI E82-0703 standard “Specification for Interbay/Intrabay AMHS SEM (IBSEM)”.
  • step 404 the number of priority lots to be processed is determined.
  • an operator may specify to the MES the number of priority lots that are to receive expedited processing.
  • the MES may indicate to the MCS that the specified number of carriers containing the priority lots are to be processed as soon as possible and delivered to substrate loading stations before non-priority lots.
  • priority lots may be expedited individually (e.g., a single carrier may contain the priority lot) and step 404 may not be required.
  • the MCS may activate a priority lot processing mode and direct each substrate loading station associated with a processing tool that is to process the priority lot, to reserve the appropriate number of internal carrier storage locations within the respective substrate loading station.
  • the MCS may thus include logic (e.g., an algorithm implemented as a program) to identify and select specific internal storage locations within a substrate loading station that, for example, are storing carriers with substrates that can be processed quickly (e.g., relative to other carrier's substrates) and/or substrates that will not be processed for a long time (e.g., relative to other carrier's substrates).
  • the individual substrate loading stations may make the selection of storage locations to reserve for storage of the priority lots.
  • the number of internal carrier storage locations that are reserved may be based on the number of priority lots and/or the number of priority lots that are anticipated to be present in a substrate loading station at one time. In other words, the number of reserved locations may be equal to or less than the number of priority lots moving through the system. For example, if there are fifteen priority lots, it may be that only ten carrier storage locations may need to be reserved because, e.g., by the time ten priority lot carriers have been moved into the substrate loading station's storage locations, five priority lots may have already been processed and removed from the substrate loading station. In some embodiments, the number of reserved locations may be greater than the number of priority lots. For example, lots may be assigned different levels of priority relative to each other and some substrate loading stations may reserve a fixed number of storage locations for higher priority lots. In some embodiments, one or more ports for a processing tool within a substrate loading station may be reserved for use with priority lots.
  • the MCS and/or each of the relevant substrate loading stations may make the respective number of reserved internal carrier storage locations available for use with the priority lots.
  • non-priority lots occupying reserved locations may be transferred to alternate storage locations, for example, at other substrate loading stations or stockers associated with the transport system.
  • non-priority lots occupying reserved locations may be processed by the tool served by the substrate loading station and then transferred to a non-reserved storage location within a next substrate loading station serving a next processing tool. Carriers containing non-priority lots that continue to arrive at the substrate loading station are prevented from being stored in the reserved storage locations.
  • Non-priority lots are either stored in any available non-reserved storage locations or transferred to alternative storage locations in other substrate loading stations or buffer stockers.
  • lot selection scheduling by the MES may be modified from a conventional scheduling algorithm.
  • the MES may store information about the total capacity of each substrate loading station and the number of carriers currently stored at each substrate loading station. From this information, the MES may determine which lots need to be moved or processed on the particular tool requiring internal storage locations to be made available. In some embodiments, priority lots may be stored temporarily in alternate storage locations awaiting the availability of reserved locations and then be automatically moved to the reserved locations as non-priority lots are removed.
  • the carriers containing the priority lots may be transferred to the reserved internal carrier storage locations within the substrate loading station serving the processing tool to which such carriers are destined.
  • the priority lots may be transferred into the reserved storage locations as soon as each reserved storage location becomes available. At this point, any newly arriving non-priority lots may only be transferred into the substrate loading station if a non-reserved internal storage location becomes available.
  • the process 400 completes.
  • the reserved storage locations may be made available for storing non-priority lots, either from the alternate storage locations or newly arriving.
  • the number of reserved storage locations may be incrementally decreased.
  • FIG. 5 depicts a moment of operation of an embodiment of the present invention, operating without the use of priority lots. More specifically, operation of a transport'system 500 including a MES 502 and three substrate loading stations 504 , 506 , 508 serving associated processing tools PT 1 , PT 2 , PT 3 , respectively under a heavy throughput condition is depicted.
  • the MES 502 determines the next best process tool for the lot. In the example, processing tool PT 3 was selected. Solid squares represent lots waiting to be processed, empty squares represent empty storage locations, and striped squares represent lots that are (or were) in alternate storage locations.
  • the MES 502 may have sent a transfer command to an MCS 510 to move the lot processed at processing tool PT 1 to processing tool PT 3 .
  • the MCS 510 may have determined that internal storage was not available in processing tool PT 3 , so the lot was stored in alternate storage in processing tool PT 2 .
  • Processing tool PT 2 may have been chosen because processing tool PT 2 was the first device in an alternate storage list of processing tool PT 3 that had storage capacity at the time.
  • FIG. 5 shows a storage space 512 that has become available in processing tool PT 3 and a lot 514 designated for processing tool PT 3 (previously stored in an alternate location in processing tool PT 2 ) being automatically moved on the transport system 500 under the direction of the MCS 510 to the available storage location 512 in processing tool PT 3 . Because in this example, all lots have the same priority, there are no conflicts and needed lots will be in processing tool PT 3 when “move in requests” for the lots are issued.

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TW200535078A (en) 2005-11-01
US20050273190A1 (en) 2005-12-08
KR20060043261A (ko) 2006-05-15
US20070124010A1 (en) 2007-05-31
CN100426452C (zh) 2008-10-15
CN1681083A (zh) 2005-10-12

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